Door drive mechanism especially for garage doors or industrial doors, comprises reference value indicator arranged in motor or in door drive gearing

摘要

The door drive mechanism has an actual value indicator for determining the actual position of the door panel. It also has a reference value indicator which outputs a signal when a reference point position is reached, or causes a signal change on the basis of which the actual value indicator is calibrated. The reference value indicator is arranged in the motor (10) or in the door drive gearing (20) and has reference points arranged asymmetrically around its circumference.